Benjamin Woodruff
c3eea02855
Bug: When appending a node, we weren't setting the tail's `next` value correctly.
66 lines
1.9 KiB
TypeScript
66 lines
1.9 KiB
TypeScript
/**
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* Copyright (c) 2017 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { assert } from 'chai';
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import LRUMap from './LRUMap';
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describe('LRUMap', () => {
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it('can be used to store and retrieve values', () => {
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const map = new LRUMap(10);
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map.set('keya', 'valuea');
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map.set('keyb', 'valueb');
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map.set('keyc', 'valuec');
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assert.strictEqual(map.get('keya'), 'valuea');
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assert.strictEqual(map.get('keyb'), 'valueb');
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assert.strictEqual(map.get('keyc'), 'valuec');
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});
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it('maintains a size from insertions', () => {
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const map = new LRUMap(10);
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assert.strictEqual(map.size, 0);
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map.set('a', 'value');
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assert.strictEqual(map.size, 1);
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map.set('b', 'value');
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assert.strictEqual(map.size, 2);
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});
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it('deletes the oldest entry when the capacity is exceeded', () => {
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const map = new LRUMap(4);
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map.set('a', 'value');
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map.set('b', 'value');
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map.set('c', 'value');
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map.set('d', 'value');
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map.set('e', 'value');
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assert.isNull(map.get('a'));
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assert.isNotNull(map.get('b'));
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assert.isNotNull(map.get('c'));
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assert.isNotNull(map.get('d'));
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assert.isNotNull(map.get('e'));
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assert.strictEqual(map.size, 4);
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});
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it('prevents a recently accessed entry from getting deleted', () => {
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const map = new LRUMap(2);
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map.set('a', 'value');
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map.set('b', 'value');
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map.get('a');
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// a would normally get deleted here, except that we called get()
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map.set('c', 'value');
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assert.isNotNull(map.get('a'));
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// b got deleted instead of a
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assert.isNull(map.get('b'));
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assert.isNotNull(map.get('c'));
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});
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it('supports mutation', () => {
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const map = new LRUMap(10);
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map.set('keya', 'oldvalue');
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map.set('keya', 'newvalue');
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// mutation doesn't change the size
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assert.strictEqual(map.size, 1);
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assert.strictEqual(map.get('keya'), 'newvalue');
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});
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});
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